Based on the output obtained, please answer the following questions:
What are the OLS estimates of the coecients on X3 and D4? State verbally how you would interpret each of these numbers.
What 95% condence interval has been obtained for the coecient on X2? And what 99% condence interval? Why do they die?
Which variables are statistically significant at the 1% level? Use, at least, two procedures to justify your answer and state clearly the steps taken to reach your conclusion.
Are the explanatory variables as a whole significant? That is, is R2 statistically significantly different from zero? Why?
